FilingCalendarCannotBeDeleted
Example
{
	"code": "FilingCalendarCannotBeDeleted",
	"target": "Unknown",
	"details": [
		{
			"code": "FilingCalendarCannotBeDeleted",
			"number": 900,
			"message": "Unable to delete this filing calendar",
			"description": "There is a current approved worksheet for this filing calendar.  Filing calendars cannot be deleted with an approved worksheet associated with it.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/FilingCalendarCannotBeDeleted",
			"severity": "Error"
		}
	]
}
Explanation

Filing calendars cannot be deleted after they have been used to approve a tax return for filing. Once a filing calendar has been used, it must be retained for audit purposes.

To stop filing on a filing calendar, please use the expire API.